Design Essentials Silk Essentials is an exceptional thermal strengthening serum created with 17 amino acids, which serve to strengthen damaged hair and smooth the hair shaft while improving hair manageability, eliminating static, and imparting a high gloss finish. This lightweight heat protectant provides an immense shine while sealing the cuticle and locking moisture into the hair when blow-drying, flat-ironing, or using hot styling tools.